Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Menacing (8)
  2. 5a Secular (4)
  3. 9a Dromedary (5)
  4. 10a Ramshackle (2,5)
  5. 11a It keeps hair oil off the back of a chair (12)
  6. 13a Nabokov's nymphet (6)
  7. 14a Swiss house with sloping roof and wide eaves (6)
  8. 17a Went from bad to worse (12)
  9. 20a (Of time) passed (7)
  10. 21a Audibly (5)
  11. 22a Architect of Buckingham Palace, d. 1835 (4)
  12. 23a Car on end (anag) — artillery (8)
  13. 1d Dissenting clique (4)
  14. 2d In name only (7)
  15. 3d Concern for number one (4-8)
  16. 4d Hebrew prophet who rebuked Ahab and Jezebel (6)
  17. 6d First sign of the zodiac (5)
  18. 7d Male singer operated on before puberty to retain his soprano voice (8)
  19. 8d Relax after a crisis (7,5)
  20. 12d Beat repeatedly with a heavy object (8)
  21. 15d Now idle (anag) — short rest (3-4)
  22. 16d Give thought to (6)
  23. 18d Golf course hazards (5)
  24. 19d Not in active use (4)